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The word act, as used in the term Act of Congress, is a common, not a proper noun. The capitalization of the word act is deprecated by some dictionaries and usage authorities. Some writers, in particular the U.S. Code, capitalize Act.
If the term does not refer to a specific district court, it would not be capitalized. A civil action is commenced by filing a complaint in the district court.. District court is capitalized when it is used in the name of a specific court. The Alberman case was decided by the United States District Court for the Southern District of Ohio. or Judge Samuels was appointed to the Dayton District Court in 2005. If the term does not refer to a specific district court, it would not be capitalized.